We'd both woken early one morning still Horny after a very busy night together, the room smelt like sex, the sheets were still damp with sweat, and the memories of the night only made us hotter. We started kissing and touching each other but it wasnt long before we were getting a lot heavier... then the phone rang, we screened, it was my girlfriends Mother and she sounded a little stressed so we answered. Soon It was pretty evident from the look on my partners face that it was nothing serious and she was wishing she hadnt stopped, I started kissing her back and she moaned, her mother must have heard it, so my girl told her she was getting a massage and nudged me to keep going, about 2 mins later Our door opened and our neighbour (KC) came into the room and jumped into the Bed, joking that if she'd interrupted anything then too Bad, she wasnt getting any then neither were we. I shushed her and told her it was Mum, then went back to kissing my girls back. We always hung around and chilled together and KC snuggled up against my back, and said where's my massage, I was so horny that I slipped my hand behind my back straight between her legs, she had pyjamas on with no knickers and she was very wet. She was a bit shocked but hid it well, we had often joked about having sex together but never anything serious, I knew my Girl was Bi but we had always been monogamous. I got more game and spooned up to my girl, slipping into her easily, she moaned again and so did I as KC bit down on my shoulder and ground her hips harder into my hand and probing fingers, I wasnt even sure if my girl knew what was happening to her friend behind me, but I knew she was enjoying me and having more trouble talking to mum, then KC suddenly shuddered moaned and came on my fingers. My girlfriend slipped (well almost jumped off me) and turned to see KC mouth the words OH GOD, she instantly said Mum ive got to go, hung up and jumped over me and straight between KC's legs, I still wonder if her mother ever knew what happened while she was on the phone that day, I know for a fact that she has no idea of the things her sweet innocent Daughter had to go for so quickly, and judging by the way the Girls knew each others bodies and turn-ons my girlfriend had her own little secrets about our supposed monogamy.